首页
登录
职称英语
The speaker mainly discusses ______. [br] [originaltext] In the early 1800s
The speaker mainly discusses ______. [br] [originaltext] In the early 1800s
游客
2023-11-08
33
管理
问题
The speaker mainly discusses ______. [br]
In the early 1800s, the paper industry was still using rags as its basic source of fiber as it had for many centuries. However, the rag supply couldn’t keep up with the growing demand for paper. The United States alone was using 250 thou sand tons of rags each year. And a quarter of that had to be imported. It was clear that a new source of fiber was needed to keep up with the demand for paper. The answer to this problem turned out to be paper made from wood pulp, something that was abundantly available in North America. In Canada, the first wood pulp mill was set up in 1866, and it was immediately successful. But while wood pulp solved the problem of quantity, it created a problem of quality. Wood contains a substance called lignin. The simplest way to make large quantities of cheap paper involves leaving the lignin in the wood pulp. But lignin is acidic and its presence in paper has shorted the life expectancy of paper from several centuries for rag paper to less than a century for paper made from wood pulp. This means that books printed less than a hundred years ago are already turning yellow and beginning to disintegrate, even though books printed much earlier may be in fine condition. This is bad enough for the older books on your bookshelf, and it poses a huge problem for libraries and the collections of government documents, too.
选项
A、people wanted higher quality paper
B、paper made from rags deteriorated too quickly
C、wood pulp had become too expensive
D、the supply of rags was insufficient
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3167978.html
相关试题推荐
Accordingtothenews,whatdidNOThappentoUSeconomy?[br][originaltext]
Accordingtothenews,whatdidNOThappentoUSeconomy?[originaltext]Con
Whywastheman’sbodydugupfromaMuslimcemetery?[originaltext][29A]
Thespeakermainlydiscusses______.[br][originaltext]Intheearly1800s
Thespeakermainlydiscusses______.[br][originaltext]Intheearly1800s
Thespeakermainlydiscusses______.[br][originaltext]Intheearly1800s
Whatdopeopleknowaboutearlydolls?[originaltext]Nobodycaneverknoww
WhereisthetownofSanJuanCapistrano?[br][originaltext]M:So,Rebecca,wh
WhereisthetownofSanJuanCapistrano?[br][originaltext]M:So,Rebecca,wh
WhereisthetownofSanJuanCapistrano?[br][originaltext]M:So,Rebecca,wh
随机试题
Accordingtotheconversation,whatkindofweatherisusualforMarch?[br][o
Acollegegraduatejuststartedajobandhefoundsomethingstrange.Oneof
某医疗机构接诊了一例鼠疫患者,该机构应在几小时内报告到疾病预防控制机构A.2小时
设备的贬值因素比较复杂,主要包括()。A.实体性贬值 B.非实体性贬值
男,60岁。咳嗽气喘15年余,每至冬季加重,面色淡白,咳声无力,动则气喘,痰清稀
前列腺增生症肾阳衰微证选用的方药为A.八正散 B.沉香散 C.补中益气汤
各国法律所规定的征收的法定条件有()。A:为了国家发展的需要 B:为了公共利益
并联电容器组例行巡视时应检查避雷器垂直和牢固,外绝缘无破损、裂纹及放电痕迹,运行
以下是2000年全国资金流量表的部分资料,请根据这些资料对反映该年宏观经济运行的
以下有关公安机关性质的描述正确的是( )A.公安机关是国家行政机关的重要组成部
最新回复
(
0
)